CW 3110 R21 SUB-GRADE, SUB-BASE AND BASE COURSE …

3.1.5 Dispose of material in accordance with Section 3.4 of CW 1130. 3.2 Excavation 3.2.1 Excavate site material to the depth that accommodates the pavement structure as shown on the Drawings or as directed by the Contract Administrator. 3.2.2 Stockpile suitable sub-grade material and suitable site sub-base material at locations on site

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Pavement Design Basics

Subgrade. Overview of Rigid Pavement Subbase Design • Base layer combinations for concrete slab support (CRCP or CPCD): – 4 in. of hot-mix asphalt (HMA) or asphalt treated base (ATB), or – a minimum 1 in. hot-mix asphalt bond breaker over 6 in. of a cement treated base. L o a d. Rigid Pavement. Subgrade. 4" HMA or ATB. Stabilized ...

Aggregate Base Enhancement with Biaxial Geogrids for ...

subgrade conditions will dictate the type and thickness of the pavement structure. 5.1 Subgrade Materials Sampling and Testing Subgrade material samples should be collected from the proposed pavement alignment section or for the existing pavement from the edge of the road to determine gradation, Atterberg limits, and R-values.

SPECIAL SPECIFICATION FOR SUBGRADE AND FOUNDATION ...

Disposition of issued materials: The information transmitted by this issuance will reside in the Special Specifications directory of the Toolbox Server . PURPOSE: The purpose of this EI is to issue special specifications 204.20000017 (US Customary) and 204.20 17 (Metric) Subgrade and Foundation Improvement – Polymer Injection.

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Crushed Concrete Screenings Strata Materials. Crushed Concrete. Screenings. Crushed concrete screenings, also known as 3/8" minus, is an ultra-fine subgrade material for landscaping, patio paving, sidewalk construction, and backfill projects. Product Usage. Screenings compact well, produce . get price

Construction Manual - NCDOT

Any surplus material generated in the preparation of a subgrade and not needed in the immediate adjacent areas of subgrade being prepared may be stored or stockpiled by the Contractor. This material is considered as unclassified excavation and should be utilized as such in the remaining phases of project construction.

Subgrades & Subbases for Concrete Slabs - Concrete Network

Jul 31, 2018· The type of soil (or subgrade material) determines the type of equipment needed for compaction: Cohesive soils need to be sheared to get compaction, so you need a machine that has high impact force. A rammer is the best choice, or for bigger jobs, a pad-foot roller (similar to a sheepsfoot roller). Lifts for compaction of cohesive soils should ...

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Modulus of Subgrade reaction - Which one to use

subgrade reaction can be improved or increased with a granular aggregate or cement-treated (or other stabilizing materials) base material (Ref's. 10 and 11). Tables and charts for these increased subgrade reaction values using base materials can be found in a number of publications (Ref. 12, P. 6; Ref. 13, P. 6; Ref. 14, P. 3).

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Resilient Modulus Characteristics of Soil Stabilized ...

subgrade lies in the fact that if it fails the performance of the whole road will be affected. A sub-grade must be able to resist the effects of both traffic and weather 1.2 Granular sub-base The work consist of laying and compacting granular material such as natural sands, moorum, gravel, laterite, kankar on

Effects of Principal Stress Rotations and Excess Pore ...

Sep 29, 2021· AbstractThe Airfield Mat 2 (AM2) matting system typically is employed as an expedient surface for airfields. It usually is emplaced over soft existing subgrades due to logistical, material, and equipment constraints. As a result, rutting is the primary failure mechanism. This problem is accentuated by the issue of traffic wander from landing aircraft. Mechanistic …

250+ TOP MCQs on Highway Materials – Subgrade and Answers

b) Cement. c) Soil. d) Aggregate. Answer: c. Clarification: Subgrade is the bottom layer of pavement and it is made by compacting the soil in the area. Bitumen is used as a binder and weathering course. Cement is used in rigid pavement top layer. Aggregates are used in sub-base and base course. 2.

Research Project Title: Subgrade Stabilization ME ...

subgrade material and b) the stabilized subgrade material, as appropriate. Performing such tests for a variety of stabilization materials and methods and developing design parameters to be implemented at the design stage will be critical to the overall scope of this project. Task 3. Laboratory Testing

MATERIAL SPECIFICATION FOR AGGREGATES - BASE, …

1010.05 MATERIALS . 1010.06 EQUIPMENT - Not Used . 1010.07 PRODUCTION . 1010.08 QUALITY ASSURANCE . 1010.09 OWNER PURCHASE OF MATERIAL - Not Used . APPENDICES . 1010-A Commentary . 1010.01 SCOPE . This specification covers the requirements for granular aggregate materials for use in subgrade, subbase,

"Evaluation of Laboratory Durability Tests for Stabilized ...

May 17, 2008· The two subgrade soils used were a silty sand and a lean clay, while the four stabilizer types included Class C fly ash, lime-fly ash, lime, and Type I/II portland cement. The three tests used in this comparative study were the freeze-thaw test, the vacuum saturation test, and the tube suction test. On average, to achieve the same 7-day ...

Evaluation of Pavement Base and Subgrade Material ...

pavement materials. Researchers tested five subgrade soils, i.e., sand, lean clay, fat clay, silt, and sandy gravel, and four base materials, i.e., crushed limestone, caliche, shellbase, and iron ore gravel, according to Texas specifications to obtain a database of material properties for developing the prediction equations.

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ITEM 204 SUBGRADE COMPACTION AND PROOF ROLLING / …

subgrade material which includes wet or soft subgrade and rock, shale, and coal in the subgrade. Use removed or excavated materials in the Work when the material conforms to the specifications; if not, then recycle or dispose of the material according to 105.16 and 105.19. 204.02 Materials.

(PDF) CONSTRUCTION OF SUBGRADE, SUBBASE AND BASE LAYERS ...

Any soft areas in embankment, be removed and replaced by app.material, compaction Tests On Borrow Materials Of Embankment/subgrade Test Desirable Frequency / 3000 cum Gradation/ Sand Content 2 Tests Plasticity Index 2 Tests Modified Proctor Test 2 Tests CBR on a set of 3 One Test Specimens Deleterious Constituents As Required Natural Moisture ...

Formation and Its Drainage | Drainage | Soil

like subgrade and ballast material, weather, size of ties, weight of rail, volume and speed of traffic and axle loadings. Design of ballast section & width of subgrade is based on expected traffic at least 10 to 15 years in future. The cost of extra width at the time of construction should be balanced against estimated future cost of roadbed ...

Design Guidelines - Pavement Design

subgrade material properties. 1.2.0 SCOPE This guideline sets out recommended procedures for:- (a) the sampling and testing of pavement subgrade materials (b) adoption of design CBR for pavement subgrade materials (c) design methods for determining flexible pavement thickness (d) design methods for rigid pavements (i.e. reinforced concrete)

SECTION 302-SUBGRADE TREATMENT (LIME)

Subgrade Treatment (Lime) shall consist of in-place subgrade material and lime uniformly mixed, moistened, compacted and cured, in accordance with these Specifications, and shaped in reasonably close conformity to the lines, grades, thickness and cross sections shown on the Plans or as directed by the Engineer. 302.02-General.

Experimental Research on Mechanical Property and ...

Aug 12, 2020· In order to promote the sustainable use of oil shale residues, a novel subgrade material (SOF) composed of silty clay, oil shale ash residue, and fly ash was developed. The aim of this paper is to study the mechanical behavior and environmental impact of SOF, which is regarded as the safety assessment and prediction for the application of this novel material. To …

Standard Specifications Manual SERIES 200 - SUBGRADE …

approved material as established by the Engineer or designated representative. Any deviation in the subgrade cross section which exceeds 1/2 inch in a length of 10 feet (12 mm in a length of 3 meters), measured longitudinally, shall be corrected by loosening, adding or removing material, and then reshaping and compacting by sprinkling and rolling.

Chapter 5 (continued) - NHI-05-037 - Geotech - Bridges ...

Subgrade strength is also an important issue during pavement construction. The preferred method for characterizing the stiffness of unbound pavement materials is the resilient modulus M R (Section 5.4.3), which is defined as the unloading modulus in cyclic loading. The AASTHO Design Guides beginning in 1986 have recommended the resilient ...

E: Test Procedure for Resilient Modulus of Unstabilized ...

3.3 Material Type I: For the purposes of resilient modulus testing, Material_Type ~ includes all unbound granular base and subbase material and all untreated subgrade soils which meet Me criteria of less than 70% passing Me 2.00 mm (No. 10) sieve and less Man 20% passing the 75 Am (No. 200) sieve, and which have a plasticity index ~ 10.

07-01-10 207-R-575 SUBGRADE TREATMENT FOR TRAILS …

Type V. 3 in. (75 mm) of subgrade excavated and replaced with 3 in. (75 mm) coarse aggregate No. 53. SECTION 207, AFTER LINE 126, INSERT AS FOLLOWS: The existing railroad ballast and railroad bed material shall be excavated to the depth specified for subgrade treatment, type and graded as shown on the plans, or as V